feat: added support for client and frontend tokens to offline mode.

[chriswk]

Also assumes tokens passed in --tokens are client tokens, so if instantiated in offline mode with the current way of --tokens <token1>, another node connected to it, will get a validation result saying this token is a client token. If one wants to add frontend tokens, use --frontend-tokens.

Discussion points

Not a 100% sure we really want to add this, but it feels like a better solution than what we currently have where offline nodes just refuses any edge clients. (It still works with an offline node from a normal SDK, but Edge is not a normal SDK)

fixes: #463

[github-actions[bot]]

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